package com.springcloudalibaba.controller;

import com.alibaba.csp.sentinel.annotation.SentinelResource;
import com.alibaba.csp.sentinel.slots.block.BlockException;
import com.springcloud.entities.CommonResult;
import com.springcloud.entities.PayMent;
import com.springcloudalibaba.service.PaymentService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import javax.annotation.Resource;

@RestController
@Slf4j
public class CircleBreakerController {
    public static final String SERVICE_URL = "http://nacos-payment-provider";
    @Resource
    private RestTemplate restTemplate;

    @RequestMapping("/consumer/fallback/{id}")
   // @SentinelResource(value = "fallback", fallback = "handlerFallback")//fallback 负责业务异常 只配置handlerFallback
   // @SentinelResource(value = "fallback",blockHandler = "blockHandler") //blockHandler负责在sentinel里面配置的降级限流//fallback 负责业务异常 只配置 blockHandler
    //blockHandler负责在sentinel里面配置的降级限流//fallback 负责业务异常 配置blockHandler 需要配置熔断机制一起生效
    //handlerFallback 可以独自生效
    //若 blockHandler 和 fallback 都进行了配置，则被限流降级而抛出 BlockException 时只会进入 blockHandler 处理逻辑。
    @SentinelResource(value = "fallback",fallback = "handlerFallback",blockHandler = "blockHandler")
    public CommonResult<PayMent> fallback(@PathVariable Long id) {
        CommonResult<PayMent> result = restTemplate.getForObject(SERVICE_URL +
                "/paymentSQL/" + id, CommonResult.class, id);
        if (id == 4) {
            throw new IllegalArgumentException("IllegalArgumentException,非法参数异常");
        } else if (result.getData() == null) {
            throw new NullPointerException("ullPointerException,该ID没有对应记录,空指针异常");
        }
        return result;
    }
    public CommonResult handlerFallback(@PathVariable Long id,Throwable e){
        PayMent payMent = new PayMent(id, "null");
        return new CommonResult<>(444,"兜底异常handlerFallback,exception内容  "
                +e.getMessage(),payMent);
    }
    public CommonResult blockHandler(@PathVariable  Long id,BlockException blockException) {
        PayMent payment = new PayMent(id,"null");
        return new CommonResult<>(445,"blockHandler-sentinel限流,无此流水: blockException  "+blockException.getMessage(),payment);
    }
    //==================OpenFeign
    @Resource
    private PaymentService paymentService;
    @GetMapping(value = "/consumer/openfeign/{id}")
    public CommonResult<PayMent> paymentSQL(@PathVariable("id") Long id)
    {
        if(id == 4)
        {
            throw new RuntimeException("没有该id");
        }
        return paymentService.paymentSQL(id);
    }


}
